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INTRODUCTION Coxarthrosis is one of the most frequent and disabling pathologies. 20% of those over 60 years of age will develop symptomatic coxarthrosis and 10% end with a hip replacement. Hip arthroplasty is an alternative because it increases the quality of life. When we recommend arthroplasty in clinical practice, patients often ask about the prognosis of their other hip. Will it deteriorate in the same way? Will it be necessary to operate it? When? The objective is to determine if there is any variable or radiological sign that predicts the medium-term prognosis of the contralateral hip after total hip arthroplasty. MATERIAL AND METHODS A retrospective study of patients who underwent Total Hip Arthroplasty in our hospital during 2011 and 2012 was carried out, with a total of 543 patients. The degree of coxarthrosis was determined at the time of the first arthroplasty and at regular intervals during follow-up, according to the JOA and Tónnis classifications, analyzing each of the items included in these classifications. RESULTS A progression of osteoarthritis of the contralateral hip could be expected in the next 3 years in 10% of patients. This progression will be greater and faster in those with grade II-III and, especially, in those with greater joint narrowing and greater alteration of the femoral head, and can reach between 25 and 30% of patients. CONCLUSIONS The degree of initial JOA is a predictive factor for requiring a hip replacement on the contralateral side.

INTRODUCTION The number of knee replacements has increased significantly, and is projected to increase further by 2030. Wound closure is one of the research areas. Arthroplasties require a large incision to achieve adequate exposure. This implies long closure and healing times. Barbed sutures are not new as they were introduced in 1964. Since then, multiple improvements have been made to these sutures and their use has expanded to various fields. Despite the potential advantages, barbed sutures are not commonly used in knee replacements. This may be due to the higher cost and uncertain clinical benefits. The objective is to determine the effect of barbed sutures compared to traditional braided sutures in knee arthroplasties by analyzing certain clinical results. MATERIAL AND METHODS A prospective observational study was carried out analyzing the arthroplasties operated during one year. Those in which the barbed suture was used for the closure of the arthrotomy and/or subcutaneous cellular tissue were compared with those in which a traditional braided suture was used. RESULTS No statistically significant differences were observed between both sutures in terms of range of motion, functional status, and surgical complications. Regarding the time of surgery, a difference of 10 minutes was observed in favor of barbed sutures, the closure time being statistically significant. CONCLUSIONS Barbed sutures contribute to greater surgical effectiveness, cost savings, surgical time, and comparable complication rates.

INTRODUCTION In Spain, the state of alarm, decreed by the COVID-19 pandemic, forced a home confinement that included the suspension of school activity. Our purpose is to examine how it affected the epidemiology of pediatric fractures in a tertiary hospital. MATERIAL AND METHODS Retrospective cohort study comparing the epidemiology and management of pediatric fractures in our centre during the COVID-19 pandemic in relation to the previous year. The "pandemic" cohort includes patients seen during this state of alarm (03/14/2020 to 06/21/20); and the "pre-pandemic" cohort the same period of 2019. RESULTS Between both periods, 233 pediatric patients were treated for 258 fractures. There were no significant changes in their age or sex. The incidence of fractures was decreased by 66%. Despite this decrease, the percentage of fractures that required surgical intervention doubled. The time until the evaluation in the emergency room was also modified, with a higher proportion of patients seen more than 24 hours after the trauma. Regarding the anatomical locations, a reduction in bicortical fractures stands out, in contrast to greenstick fractures and epiphysiolysis. CONCLUSIONS The COVID-19 pandemic has changed the epidemiology of pediatric fractures. There was a reduction in the incidence of fractures and a delay in hospital care, probably due to fear of going to the hospital due to the risk of contagion. Home confinement may justify the lower proportion of high-energy distal radius fractures, such as bicortical fractures.

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